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A Giant Dapediid from the Late Triassic of Switzerland and Insights Into Neopterygian Phylogeny

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A Giant Dapediid from the Late Triassic of Switzerland and Insights Into Neopterygian Phylogeny Zurich Open Repository and Archive University of Zurich Main Library Strickhofstrasse 39 CH-8057 Zurich www.zora.uzh.ch Year: 2018 A giant dapediid from the Late Triassic of Switzerland and insights into neopterygian phylogeny Latimer, Ashley E ; Giles, Sam Abstract: A new Triassic neopterygian is described on the basis of a large three-dimensional neurocranium from the Rhaetian (Late Triassic) of the Ko¨ ssen Formation (Schesaplana, Grisons, Switzerland). CT scanning reveals neurocranial features similar to Dapedium, suggesting that this new genus, Scopulipiscis saxciput gen. et sp. nov., was deepbodied and potentially durophagous, although no associated dental material is known. An expanded phylogenetic analysis of actinopterygians resolves Dapediidae as a clade (inclusive of Tetragonolepis), although fails to recover any characters supporting the monophyly of the genus Dapedium. Dapediids are resolved as stem holosteans, filling a conspicuous gap in early neopterygian relationships. Pycnodonts, previously suggested as either stem teleosts or the sister group to dapediids, are resolved as a clade on the neopterygian stem. Similarities between the new taxon described here and Dapedium provide insights into morphological disparity within early members of the group— suggesting that the ecological expansion of dapediids originated prior to the End-Triassic extinction—as well as contributing to a growing understanding of endocranial anatomy in Palaeozoic and Early Mesozoic actinopterygians. DOI: https://doi.org/10.1098/rsos.180497 Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-153643 Journal Article Published Version The following work is licensed under a Creative Commons: Attribution 4.0 International (CC BY 4.0) License. Originally published at: Latimer, Ashley E; Giles, Sam (2018). A giant dapediid from the Late Triassic of Switzerland and insights into neopterygian phylogeny. Royal Society Open Science, 5:180497. DOI: https://doi.org/10.1098/rsos.180497 Downloaded from http://rsos.royalsocietypublishing.org/ on September 7, 2018 A giant dapediid from the Late Triassic of Switzerland rsos.royalsocietypublishing.org and insights into neopterygian phylogeny Research Cite this article: Latimer AE, Giles S. 2018 A Ashley E. Latimer1 and Sam Giles2 giant dapediid from the Late Triassic of 1 Switzerland and insights into Paleontological Institute and Museum, University of Zurich, Zurich 8052, Switzerland 2Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, UK neopterygian phylogeny. R. Soc. open sci. 5: 180497. AEL, 0000-0002-2342-9796; SG, 0000-0001-9267-4392 http://dx.doi.org/10.1098/rsos.180497 A new Triassic neopterygian is described on the basis of a large three-dimensional neurocranium from the Rhaetian (Late Triassic) of the Ko¨ssen Formation (Schesaplana, Grisons, Switzerland). CT scanning reveals neurocranial Received: 26 March 2018 features similar to Dapedium, suggesting that this new Accepted: 9 July 2018 genus, Scopulipiscis saxciput gen. et sp. nov., was deep- bodied and potentially durophagous, although no associated dental material is known. An expanded phylogenetic analysis of actinopterygians resolves Dapediidae as a clade (inclusive Subject Category: of Tetragonolepis), although fails to recover any characters supporting the monophyly of the genus Dapedium. Dapediids Biology (whole organism) are resolved as stem holosteans, filling a conspicuous gap in early neopterygian relationships. Pycnodonts, previously Subject Area: suggested as either stem teleosts or the sister group to evolution/taxonomy and systematics/ dapediids, are resolved as a clade on the neopterygian palaeontology stem. Similarities between the new taxon described here and Dapedium provide insights into morphological disparity Keywords: within early members of the group—suggesting that the Actinopterygii, CT scanning, holostei, durophagy, ecological expansion of dapediids originated prior to the End-Triassic extinction—as well as contributing to a growing neurocranium, inner ear understanding of endocranial anatomy in Palaeozoic and Early Mesozoic actinopterygians. Author for correspondence: Sam Giles e-mail: [email protected] 1. Introduction Ray-finned fishes (Actinopterygii) constitute the majority of living vertebrate diversity, displaying a huge disparity of body forms filling a wide variety of ecological niches [1,2]. Almost all extant actinopterygians (more than 30 000 species) belong to a single group, the Teleostei, with non-teleostean actinopterygians com- prising just 56 living species [3]. The distribution of extant species Electronic supplementary material is available belies past diversity: teleosts have not always been the dominant group, having reached their current status only after the end of online at https://dx.doi.org/10.6084/m9.figshare. c.4175978. & 2018 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. Downloaded from http://rsos.royalsocietypublishing.org/ on September 7, 2018 the Cretaceous [4,5]. Indeed, their sister group, the holosteans, outstripped teleosts in terms of diversity 2 and disparity in the earliest part of their history [5], although only eight species survive in the modern. rsos.royalsocietypublishing.org Despite this, the understanding of relationships among early holosteans remains poor, in particular with regard to taxa branching outside of the living radiation. A bare stem is typically recovered in most ana- lyses (e.g. [6–9]), although a stem holostean identity has recently been suggested for Dapedium [10]. Representing an early experiment in body form and ecological diversity, Dapedium is a modestly diverse (approx. 20 species) radiation of neopterygians known from the Late Triassic (Rhaetian) to mid Jurassic (earliest Aalenian), most notable for its adaptations for durophagy. Members of this genus possess thick, interlocking ganoid scales; dense, pustular ornament; and a small mouth with styli- form teeth borne on the stout lower jaw. Other genera closely associated with Dapedium, and typically united into Dapediidae (or Dapediiformes), include Aetholepis [11], Dandya [12], Hemicalypterus [13,14], Heterostrophus [15], Paradapedium [16], Sargodon [12] and Tetragonolepis [16,17], although the dapediid affi- R. Soc. open sci. nity of at least Heterostrophus and Dandya has been called into question [13,16]. Most Dapedium species have a standard length of around 15–35 cm [18], although dapediids range in size from approximately 8cm(Dapedium noricum [12]) to approximately 1 m (Sargodon tomicus [12]). Only around five of the 30 or so known species of dapediid are present in the Triassic, and are exclusively represented by isolated teeth 5 [19] or flattened [12,14,20] remains. Consequently, their adaptation for durophagy is thought to have : 180497 facilitated the group’s success in the aftermath of the End-Triassic extinction, a time at which many other durophagous taxa went extinct [21,22]. Despite representing an important expansion into a new ecological niche, the phylogenetic position of dapediids is unclear. Initially classed as ‘semionotids’ [12,23,24], a waste-basket taxon of primitive neop- terygians, Dapedium was moved to Dapediidae by Lehman [25]. This family was erected largely on the basis of a deep-bodied phenotype [25–27], and a formal diagnosis was not provided until several dec- ades later ([28]: these authors note that a previous diagnosis, formulated by Wenz [26], was largely inaccurate). Dapediids are poorly sampled in formal phylogenetic analyses (but see [14]), typically being represented by a single, often composite, terminal [3,29–37]. Despite—or perhaps in consequence of—their limited phylogenetic consideration, dapediids have variably been considered stem teleosts [8,29–31,34,35,38–40], total group holosteans (generally sister to ginglymodians [10,12,13,18,36,37]), and, most recently, stem holosteans [10]. Historical difficulties in defining apomorphies for dapediids stem from a lack of diagnoses teamed with characters of dubious merit (such as the distribution of scale serrations and multicuspid teeth [11]) being used to distinguish between species, and the mono- phyly of Dapedium has previously been questioned [28]. Furthermore, material from the Sinemurian of Dorset is sorely in need of taxonomic revision, as has recently been carried out for German dapediid material [28,37,41]. Further uncertainty surrounds the identity of the sister taxon of dapediids. Close relationships have variably been found with pholidophorids þ leptolepids [29,34] and pachycormids [31], but most com- monly with pycnodonts [27,30,32,42]. Pycnodonts are a clade of deep-bodied neopterygians with heterodont dentition [43], and are themselves of uncertain phylogenetic affinity. They have traditionally been affiliated with teleosts [30,32,44,45], but as noted by Poyato-Ariza [46], these results largely rely on verbal argumentation or small character-by-taxon matrices. As such, they lack the quantitative rigour necessary to evaluate placement of pycnodonts relative to other neopterygians. Most analyses of neop- terygian interrelationships exclude pycnodonts [6,8,10,14,32,33,47,48], probably due to their highly specialized morphology. Furthermore, detailed analyses of pycnodont interrelationships [44,49–51] rarely include robust sampling
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